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Volumn 43, Issue 44, 2002, Pages 7937-7940

Studies toward the total synthesis of (-)-kampanol A: An efficient construction of the ABCD ring system

Author keywords

Conjugate addition; Kampanol A; Phenylselenium mediated cyclization; Ras farnesyltransferase inhibitor

Indexed keywords

BROMOBENZENE; CARBENOID; KAMPANOL A; KETONE DERIVATIVE; PHENOL DERIVATIVE; PROTEIN FARNESYLTRANSFERASE INHIBITOR; REAGENT; SELENIUM DERIVATIVE; UNCLASSIFIED DRUG;

EID: 0037190855     PISSN: 00404039     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0040-4039(02)01859-2     Document Type: Article
Times cited : (22)

References (38)
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    • 50 values of 13 μM and >100 μM, respectively (Ref. 1).
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    • The absolute configuration of 1 has not been discussed in the literature (Ref. 1).
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    • Synthetic studies including total synthesis of structurally analogous sesquiterpenoids, such as hongoquercins A and B, puupephenone and its analogues, and UPA0043 and UPA0044, have been reported. See for hongoquercins A and B: (a) Tsujimori, H.; Bando, M.; Mori, K. Eur. J. Org. Chem. 2000, 297-302; (b) Tsujimori, H.; Mori, K. Biosci. Biotechnol. Biochem. 2000, 64, 1410-1415. See for puupephenone and its analogues: © Maiti, S.; Sengupta, S.; Giri, C.; Achari, B.; Banerjee, A. K. Tetrahedron Lett. 2001, 42, 2389-2391; (d) Barrero, A. F.; Alvarez-Manzaneda, E. J.; Chahboun, R.; Cortés, M.; Armstrong, V. Tetrahedron 1999, 55, 15181-15208; (e) Barrero, A. F.; Alvarez-Manzaneda, E. J.; Herrador, M. M.; Chahboun, R.; Galera, P. Bioorg. Med. Chem. Lett. 1999, 9, 2325-2328; (f) Arjona, O.; Garranzo, M.; Mahugo, J.; Maroto, E.; Plumet, J.; Sáez, B. Tetrahedron Lett. 1997, 38, 7249-7252; (g) Barrero, A. F.; Alvarez-Manzaneda, E. J.; Chahboun, R. Tetrahedron Lett. 1997, 38, 2325-2328. See for UPA0043 and UPA0044: (h) Takao, K.; Sasaki, T.; Kozaki, T.; Yanagisawa, Y.; Tadano, K.; Kawashima, A.; Shinonaga, H. Org. Lett. 2001, 3, 4291-4294.
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    • Synthetic studies including total synthesis of structurally analogous sesquiterpenoids, such as hongoquercins A and B, puupephenone and its analogues, and UPA0043 and UPA0044, have been reported. See for hongoquercins A and B: (a) Tsujimori, H.; Bando, M.; Mori, K. Eur. J. Org. Chem. 2000, 297-302; (b) Tsujimori, H.; Mori, K. Biosci. Biotechnol. Biochem. 2000, 64, 1410-1415. See for puupephenone and its analogues: © Maiti, S.; Sengupta, S.; Giri, C.; Achari, B.; Banerjee, A. K. Tetrahedron Lett. 2001, 42, 2389-2391; (d) Barrero, A. F.; Alvarez-Manzaneda, E. J.; Chahboun, R.; Cortés, M.; Armstrong, V. Tetrahedron 1999, 55, 15181-15208; (e) Barrero, A. F.; Alvarez-Manzaneda, E. J.; Herrador, M. M.; Chahboun, R.; Galera, P. Bioorg. Med. Chem. Lett. 1999, 9, 2325-2328; (f) Arjona, O.; Garranzo, M.; Mahugo, J.; Maroto, E.; Plumet, J.; Sáez, B. Tetrahedron Lett. 1997, 38, 7249-7252; (g) Barrero, A. F.; Alvarez-Manzaneda, E. J.; Chahboun, R. Tetrahedron Lett. 1997, 38, 2325-2328. See for UPA0043 and UPA0044: (h) Takao, K.; Sasaki, T.; Kozaki, T.; Yanagisawa, Y.; Tadano, K.; Kawashima, A.; Shinonaga, H. Org. Lett. 2001, 3, 4291-4294.
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    • While related conjugate addition reactions have been previously described in the literature, to our knowledge, the conjugate addition reaction between 10 and the Grignard reagent prepared from sterically hindered ortho-disubstituted bromobenzene derivative such as 14 is unprecedented, see: (a) Pemp, A.; Seifert, K. Tetrahedron Lett. 1997, 38, 2081-2084; (b) Mori, K.; Komatsu, M. Bull. Soc. Chim. Belg. 1986, 95, 771-781; © Welch, S. C.; Prakasa Rao, A. S. C. J. Org. Chem. 1978, 43, 1957-1961; (d) Welch, S. C.; Prakasa Rao, A. S. C. Tetrahedron Lett. 1977, 505-508; (e) Ireland, R. E.; Baldwin, S. W.; Welch, S. C. J. Am. Chem. Soc. 1973, 94, 2056-2066.
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  • 24
    • 0010733586 scopus 로고
    • While related conjugate addition reactions have been previously described in the literature, to our knowledge, the conjugate addition reaction between 10 and the Grignard reagent prepared from sterically hindered ortho-disubstituted bromobenzene derivative such as 14 is unprecedented, see: (a) Pemp, A.; Seifert, K. Tetrahedron Lett. 1997, 38, 2081-2084; (b) Mori, K.; Komatsu, M. Bull. Soc. Chim. Belg. 1986, 95, 771-781; © Welch, S. C.; Prakasa Rao, A. S. C. J. Org. Chem. 1978, 43, 1957-1961; (d) Welch, S. C.; Prakasa Rao, A. S. C. Tetrahedron Lett. 1977, 505-508; (e) Ireland, R. E.; Baldwin, S. W.; Welch, S. C. J. Am. Chem. Soc. 1973, 94, 2056-2066.
    • (1973) J. Am. Chem. Soc. , vol.94 , pp. 2056-2066
    • Ireland, R.E.1    Baldwin, S.W.2    Welch, S.C.3
  • 28
    • 84992268801 scopus 로고    scopus 로고
    • The high stereoselectivity observed for the α-hydroxylation of the ketone 5 leading to the α-hydroxyketone 6 can be accounted for by the assumption that the oxidizing reagent approaches from the less hindered α-face of the enolate generated from 5 under the influence of the axial juncture methyl group
    • The high stereoselectivity observed for the α-hydroxylation of the ketone 5 leading to the α-hydroxyketone 6 can be accounted for by the assumption that the oxidizing reagent approaches from the less hindered α-face of the enolate generated from 5 under the influence of the axial juncture methyl group.
  • 33
    • 84992251485 scopus 로고    scopus 로고
    • In general, the addition reaction of Grignard reagents to α,β-unsaturated ketones in the absence of copper salts affords 1,2-addition products. However, in this case the 1,4-addition product 15 was only obtained, and this is probably due to severe 1,3-diaxial interactions between the axial juncture methyl group in 10 and the incoming Grignard reagent of 14
    • In general, the addition reaction of Grignard reagents to α,β-unsaturated ketones in the absence of copper salts affords 1,2-addition products. However, in this case the 1,4-addition product 15 was only obtained, and this is probably due to severe 1,3-diaxial interactions between the axial juncture methyl group in 10 and the incoming Grignard reagent of 14.
  • 34
    • 84992230069 scopus 로고    scopus 로고
    • 2/-60°C→rt), the undesired C-7 epimer of 19 was exclusively produced in 86% yield. This stereochemical outcome can be rationalized by considering that the inner phenolic hydroxy group attacks the C-7 tertiary carbocation, in situ generated by acid treatment, from the less hindered α-face of the molecule under the influence of the β-oriented axial methyl group at the decalin junction
    • 2/-60°C→rt), the undesired C-7 epimer of 19 was exclusively produced in 86% yield. This stereochemical outcome can be rationalized by considering that the inner phenolic hydroxy group attacks the C-7 tertiary carbocation, in situ generated by acid treatment, from the less hindered α-face of the molecule under the influence of the β-oriented axial methyl group at the decalin junction.
  • 38
    • 84992263295 scopus 로고    scopus 로고
    • +)
    • +).


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